Reflector



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1,413,315. Specification of Letters Patent.

Application filed September 5, 1919. Serial No. 321,921. To allwhame'tmay concern:

Be it known that I, PERCY EDWARD Conmanna subject ofthe King of GreatBritain and, Ireland, residing at Verco Buildings, North Terrace,Adelaide, State of South Australia, Commonwealth of Australia, haveinvented certain new and useful Improve- I ments in Reflectors, ofwhichthe following isa specification.

This invention relates to certain new and useful improvements inreflectors applicable to headlamps for vehicles and to other lamps. Aprimary object of the invention is to prd'vide an improved reflector forheadlamps for vehicles and the like whereby a roadway in front of avehicle equipped therewith may be efliciently illuminated at night froma point in the proximity of the vehicle to a point well in advancethereof; the illumination thereby afforded being entirely free fromstreakiness such as is commonly present by many headlamps-at present inuse, and whic streakiness results from the formation on the roadway ofdistorted or imperfect or other images so as to constitute a source ofdiscomfort or danger to drivers of vehicles, and pedestrians by reasonof the eyes of such being temporarily blinded by light of excessiveintensity.

With a view to the attainment of the hereinbefore stated object, theinvention comprises a reflector having a highly light-diflu sive,light-reflecting surface and a very slightly light-diffusive lightreflecting surace.

The elimination of, streakiness in roadillumination is considered andhas been found to be a matter ofvery great importance. The illuminationof a roadway is also very much clearer and more uniform by theelimination of streakiness.

Reference is made to the accompanying drawings in which like charactersof reference indicate like parts in both views. Figures 1 and 2represent respectively sectional and front views of-the improvement Referring to the drawing B is a paraboloidal reflector formed by spinningor otherwise in accordance with well known practice from sheet-metal,and having its concave light refleeting surface electro-silver plated soas to ensure high light reflectivity thereof, serving to concentrate andto direct or re-direct lated surface.

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' impinging thereupon-the said filament being sultably positioned justinside or behind the focus of the paraboloidal reflector so thatpractically the whole of the light reflected from the lower portion orhalf of the reflector is downwardly directed. In my re flector prior toapplying the coating of silver the inner surface of the reflector 1sfrosted, granulated orroughened. The upper portion a of the reflector isheavily frosted, granulated or roughened so that when the silver coatingis applied the frosted granulated or roughened surface is substantiallyretained, thereby enlivening or rendering the surface highly reflecting.The lower portion 6 of the reflector is slightly frosted, granulated orroughened, so that the frosted,

a practically smooth surface when the ow Patented Apr. 18, 1922.,

ing of silver is applied. It is to be under-f stood that thelight-diffusivities of the said upper and lower portions or halves ofthe said concave surface of the said reflector may be varied within suchlimits as may be compatible with the respective required functioningsthereof, it being understood that with respect to the slightlightdiflusivity the slightest such nation of streakiness from theillumination afforded is preferably employed.

The'slightly llght-diifusive surface repared as aforesaid will be seento exhibit a slight sheensuc-h bein an' appearance light-drfi'lb Ys'ivity which will ensure the desired elimi-- quite distinct from that oa true frosting as enerally denoted by such term.

at I claim is 1. A reflector having its' concave surface roughened, onehalf of 'the surface being sur ace coated with silver. 2. A reflectorhaving a concave rougher than the other half and thewhole granulatedsurface, the upper half bein heavily grann lated and the-lower half sligtly granulated and a coating-of silver OII'lZhBSBld gran'u- In testimonythat I claim the as my invention I have signed my name :in

resence of two subscribing this th da ofJul 1919.

P ROY, I DW-ARD CORRELLJ Witnesses: g

Gmms Nronoms COLLISON, 1 ARTHUR Gone COLLISON.

witnesses

